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Sapphire

Sapphire

Sapphire is a single crystal aluminum oxide (Al 2 O 3 ). It is one of the hardest materials. sapphire has good transmission characteristics over the visible, and near IR spectrum. It exhibits high mechanical strength, chemical resistance, thermal conductivity and thermal stability. It is often used as window materials in specific field such as space technology where scratch or high temperature resistance is required. 

Physical Properties

Crystal Symmetry Hexagonal

 

System

Lattice constant

A

a =4.75 ; c =12.97

Transparence range

μm

0.18- 4.5

Density

g/cm 3

3.98

Mohs hardness

 

9

Melting point

2030

Thermal conductivity

W/m/K

0.04

Expansion coefficien

10 -6 /K

8.4

Refractive Index

1.0 m m

1.755

 

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